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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "remoting/host/linux/x11_keyboard_impl.h"
#include "remoting/host/linux/unicode_to_keysym.h"
#include "ui/gfx/x/future.h"
#include "ui/gfx/x/xkb.h"
#include "ui/gfx/x/xproto.h"
#include "ui/gfx/x/xtest.h"
namespace {
bool FindKeycodeForKeySym(x11::Connection* connection,
uint32_t key_sym,
uint32_t* keycode,
uint32_t* modifiers) {
auto found_keycode = connection->KeysymToKeycode(key_sym);
const x11::KeyButMask kModifiersToTry[] = {
{},
x11::KeyButMask::Shift,
x11::KeyButMask::Mod2,
x11::KeyButMask::Mod3,
x11::KeyButMask::Mod4,
x11::KeyButMask::Shift | x11::KeyButMask::Mod2,
x11::KeyButMask::Shift | x11::KeyButMask::Mod3,
x11::KeyButMask::Shift | x11::KeyButMask::Mod4,
};
// TODO(sergeyu): Is there a better way to find modifiers state?
for (auto i : kModifiersToTry) {
auto mods = static_cast<uint32_t>(i);
if (connection->KeycodeToKeysym(found_keycode, mods) == key_sym) {
*modifiers = mods;
*keycode = static_cast<uint8_t>(found_keycode);
return true;
}
}
return false;
}
// This is ported from XStringToKeysym
// https://gitlab.freedesktop.org/xorg/lib/libx11/-/blob/2b7598221d87049d03e9a95fcb541c37c8728184/src/StrKeysym.c#L147-154
uint32_t UnicodeToKeysym(uint32_t u) {
if (u > 0x10ffff || u < 0x20 || (u > 0x7e && u < 0xa0)) {
return 0;
}
if (u < 0x100) {
return u;
}
return u | 0x01000000;
}
} // namespace
namespace remoting {
X11KeyboardImpl::X11KeyboardImpl(x11::Connection* connection)
: connection_(connection) {}
X11KeyboardImpl::~X11KeyboardImpl() = default;
std::vector<uint32_t> X11KeyboardImpl::GetUnusedKeycodes() {
std::vector<uint32_t> unused_keycodes_;
uint8_t min_keycode = static_cast<uint8_t>(connection_->setup().min_keycode);
uint8_t max_keycode = static_cast<uint8_t>(connection_->setup().max_keycode);
uint8_t keycode_count = max_keycode - min_keycode + 1;
auto req = connection_->GetKeyboardMapping(
{connection_->setup().min_keycode, keycode_count});
if (auto reply = req.Sync()) {
for (int keycode = max_keycode; keycode >= min_keycode; keycode--) {
bool used = false;
int offset = (keycode - min_keycode) * reply->keysyms_per_keycode;
for (int level = 0; level < reply->keysyms_per_keycode; level++) {
if (reply->keysyms[offset + level] != x11::KeySym{}) {
used = true;
break;
}
}
if (!used) {
unused_keycodes_.push_back(keycode);
}
}
}
return unused_keycodes_;
}
void X11KeyboardImpl::PressKey(uint32_t keycode, uint32_t modifiers) {
connection_->xkb().LatchLockState(
{static_cast<x11::Xkb::DeviceSpec>(x11::Xkb::Id::UseCoreKbd),
static_cast<x11::ModMask>(modifiers),
static_cast<x11::ModMask>(modifiers)});
connection_->xtest().FakeInput(
{x11::KeyEvent::Press, static_cast<uint8_t>(keycode)});
connection_->xtest().FakeInput(
{x11::KeyEvent::Release, static_cast<uint8_t>(keycode)});
connection_->xkb().LatchLockState(
{static_cast<x11::Xkb::DeviceSpec>(x11::Xkb::Id::UseCoreKbd),
static_cast<x11::ModMask>(modifiers), x11::ModMask{}});
}
bool X11KeyboardImpl::FindKeycode(uint32_t code_point,
uint32_t* keycode,
uint32_t* modifiers) {
for (uint32_t keysym : GetKeySymsForUnicode(code_point)) {
if (FindKeycodeForKeySym(connection_, keysym, keycode, modifiers)) {
return true;
}
}
return false;
}
bool X11KeyboardImpl::ChangeKeyMapping(uint32_t keycode, uint32_t code_point) {
if (!code_point) {
return false;
}
auto keysym = UnicodeToKeysym(code_point);
if (!keysym) {
return false;
}
connection_->ChangeKeyboardMapping({
.keycode_count = 1,
.first_keycode = static_cast<x11::KeyCode>(keycode),
.keysyms_per_keycode = 2,
.keysyms = {static_cast<x11::KeySym>(keysym) /* lower-case */,
static_cast<x11::KeySym>(keysym) /* upper-case */},
});
return true;
}
void X11KeyboardImpl::Flush() {
connection_->Flush();
}
void X11KeyboardImpl::Sync() {
connection_->Sync();
}
} // namespace remoting
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